A number has exactly three factors if and only if it is the square of a prime number.
There are an infinite number of them. 8 has three prime factors, 30 is the first with three distinct prime factors.
30
625
By definition, a prime number has exactly two factors. So, there are no prime numbers with exactly three factors.
A number has exactly three factors if and only if it is the square of a prime number.
A square of any prime number, p has exactly three factors. They are 1, p and p^2.
The number 9: factors are 9, 3, and 1.
The smallest number that has exactly three factors is 4.
There are an infinite number of them. 8 has three prime factors, 30 is the first with three distinct prime factors.
30
625
4? the factors of 4 are 1,4 and 2
Numbers with three factors are squares of primes: 4, 9, 25
By definition, a prime number has exactly two factors. So, there are no prime numbers with exactly three factors.
The square of any prime number has exactly three factors: 22, 32, 52, etc.
9 The three factors are 1, 3, and 9. 9 The three factors are 1, 3, and 9.